Add the following fields in the Table 'SUBJECT' - SUBJECT_ID, SUBJECT_NAME, AUTHOR_ID. Add 15 records in the table.

To add the required fields and records to the table "SUBJECT" in a database, first, let us break down the task and go through the necessary steps to understand the operations and the rationale behind them.

### Step 1: Altering the Table to Add Fields
Before adding any records, we need to modify the existing "SUBJECT" table by adding the new fields. The fields that need to be added are `SUBJECT_ID`, `SUBJECT_NAME`, and `AUTHOR_ID`.

- SUBJECT_ID: This is likely a unique identifier for each subject. It will be a primary key or at least a unique key for each subject entry.
- SUBJECT_NAME: This will store the name of the subject.
- AUTHOR_ID: This refers to the unique identifier of the author of the subject, _____ ___ ________ _______ _______ ___.
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